Means for trimming selvage edges of rubberized fabrics



ug. 13, 1929. A. p, LEWIS 1,724,208

MEANS FOR TRIMMING SELVAGE EDGEs OF RUBBERIZED FABRICS Filed April l2, 1928 2 Sheets-Sheet l l@ f//ML @2Q/QM@ ffm/10; waff ug. S, 1929. A, p LEwls -,724,208

MEANS FOR TRIMMING SELVAGE EDGES OF RUBBERIZED FABRICS Filed April 12, 1928 2 Sheets-Sheet 2 Patented Aug. 13, 1929.

UNITED STATES .ARTHUR I P. LEWIS,

OF m021, OHIO, A CORPORATION OF. OHIO.'

MEANS FOB TmING SELVAGE Application. led April 12,'

' My said invention relates to means for trimming or cutting what is known as the rubber selvage edges of rubber coated fabric. As is well known Vto those skilled in the art, when applying a coating of rubber to fabric webs by the use of the customary calender, the rubber is sheeted by the upper rolls from a bank of rubber in the bight of the rolls, which sheet adheres to the lower roll (for example) and is carried varound therewith and' superposed on the fabric which is passed through between said lower roll and an underlying roll. `It is customary to use guides or dams on .opposite sidesfof the bank of rubber to conne the spread thereofand these guides must be set further apart than the width of the fabric to insure the complete coating of the latter, due to the fact that the edges of the fabric do not travel always in a straight line, and means must be provided for trimming off the rubber which projects beyond themargins of the fabric.` Attempts heretofore made to accomplish this have proved unsatisfactory, due to the diiculty of providing cutting. means which `would accurately follow the more or less Asinuous'or uneven edge of the fabric.

My means aims to accomplish this result in a simple, economical and etiicient manner,

the trimming being effected exactly at the edge 'of the fabric, irrespective of any and all variations therein.

The invention includes the novel means hereinafter described and defined by the ap- ,.Porhns vpended claims.

Iuthe accompanying drawings: Figure 1 is a sectional view sho conventional mannera suiiieient portion of an ordinary calender to illustrate the inven# tion, and

Fig. 2 is a rear elevation of the same,

'showing however one side only, the other being a duplicate. v

Fig. 3 is a. detailview ofthe knife cai-rying in side elevation with the sup bar shown in section. Fig. 4: is a plan view' of thesame 'broken away and showing a portion of the Vcalenderfl'ame in section.

Iig. 5 is vnner-.s or nuisisnaizaii mimics. 192s. serial Na. 269,589. I

the means for effecting longitudinal adjustment of the knife holder, parts beingbroken away.

Fig. 6 1s a section on line 6-6 of Fig. 3 also partly broken away.

drawing, 1, 2 and 3 designate respectively the upper, middle and lower rolls -of a three roll calender selected as one convenient to illustrate 4 designates they bank ofl rubber which, by the rotation of the rolls, is formed into a sheet 4 which passes around the roll to the lowerl roll 3, where it is superposed on the fabric web 5, which is fed from a suit-- able supply drum (or other Source) indicated conventionally at 5, and led between the rolls Qand` 3, to receive the rubber coating. 6 designates a thin bladed knife having a straight edge disposed in proximity to the bight of the rolls and parallel with and lin suitable point where it may be wound on a drum with an interposed liner. Such windorfaxnoiv, omo, Assieiion lro riin MILLER numana comm,

Referring by reference characters to this ing means. being common in the art, are not illustrated herein.

The blade is preferably disposed at an.v

angle to the fabric and is carried by a knife holder 7 having heating means incor orated therein or associated therewith, the b adebeing heated by conduction.

A convenient manner of heating thelmife is to make the part 7 a ofthe holder the form of a metal tube containing an Ainsulated resistance elementdesigned to be heated by the current from an ordinaryl lighting plant conducted thereto .by a lexlible cable w.

The knife blade is made Vof suilicient width as to always overlie the'edge of the fabric. .I have Ydiscovered that by so posi# tioning a knife neath the same, the tendency of the rubber to clingtothe'roll2wil1cause it to'besevered from the .fabric exactly at the edge' thereof and the line of severance accurately follow" the edge of the fabric, irrespective o f the deviations-thereof from a and leading the fabric be-,l

The severed rubber is conducted back by the `.ascending side of the roll 2 directly to the bank of rubber and is merged therein, thereby avoiding any waste.

The holder 7 is supported by a pivoted carrier 8 articulated on a bracket 9 carried, by the side frame of the calender and is provided with means for accurately adjustF mg its edge towards and from the rubbercoated face of the fabric, which means may take the form of adjusting screw 10 by which the forward portion of the carrier may be vertically adjusted.

The holder 7 is slidably supported by bracket 8 by` means such as guides 8a and means is provided for moving the holder 7 in a rectilinear path which may take' the form of adjusting screw 11. 'Thereby the knife edge may be adjusted towards or from the bight of the rolls.

Having thus described my invention, what I claim is:

1. 'The combination with the rolls of a calender adapted for applying a coating of rubber to fabric, of a knife having a straight edge disposed in proximity to and in parallelism with the bight of the rolls and in i juxtaposition and parallelism to the rubberized surface of the calender.

rmaaoe perpendicular thereto.

4in av rectilinear path' and also in a plane l 5. The combination with the rolls of* a calender adapted for applying a coating of rubber to fabric, of a bracket carried by the calender frame, a carrier pivotally supported thereby to pivot about an axis parallel to the axes of the rolls, means for adjusting said carrier about its pivotal axis, a knife .holder supported by the carrier to movein a rectilinear path towards and from the bight of the rolls, means for adjusting the holder on the carrier, and a knife supported by said carrier and having a straight edge disposed in juxtaposition to and in parallelism with the coated face of the fabric also in parallelism with the bight of the rolls and overlying the edge of the fabric and projecting a material distance on each side thereof.

1n testimony whereof I aiiix my signature. i

' ARTHUR P. LEW'IS. 

